HP Labs Technical Reports
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Exploiting Data Correlation to Reduce the Power Variance for Forward-link CDMA Sequences
Braithwaite, R. Neil
Keyword(s): wireless communications; CDMA; multiaccess communication; intermodulation distortion
Abstract: This paper investigates the effect of interactions between the Walsh codes and data sequences on the statistical moments of the forward-link CDMA signal. Of primary interest is the normalized fourth-order moment, which is referred to as the "power variance". Several techniques for reducing the power variance of the CDMA signal are discussed that are based on Walsh code selection and data encoding. Results illustrate the effects of data correlation, and demonstrate the reduction in the power variance afforded by two novel approaches referred to as "channel hopping" and "data bit reversal".
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